package com.itheima.reggie.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entiry.Category;
import com.itheima.reggie.entiry.Dish;
import com.itheima.reggie.entiry.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

@RestController
@RequestMapping("/dish")
public class DishController {
    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;

    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {

        dishService.saveWithFlavor(dishDto);

        //清理所有的菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        //动态构造key
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("新增菜品成功");
    }

    @GetMapping("/page")
    public R<Page> page(int page,int pageSize,String name){
        //构造分页构造器对象
        Page<Dish> dishPage = new Page<>(page,pageSize);
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        lambdaQueryWrapper.like(name != null,Dish::getName,name);
        //添加排序条件
        lambdaQueryWrapper.orderByDesc(Dish::getUpdateTime);
        //执行分页查询
        dishService.page(dishPage,lambdaQueryWrapper);

        //对象拷贝,不拷贝records属性
        BeanUtils.copyProperties(dishPage,dishDtoPage,"records");

        List<Dish> dishPageRecords = dishPage.getRecords();
        List<DishDto> dishDtoList = dishPageRecords.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            //将Dish中records集合数据copy到DishDto中
            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//获取菜品分类id
            Category category = categoryService.getById(categoryId);
            //有些菜品没有分类,会报空指针异常
            if(category != null){
                String categoryName = category.getName();//获取到了当前分类的名称
                dishDto.setCategoryName(categoryName);
            }

            return dishDto;
        }).collect(Collectors.toList());

        dishDtoPage.setRecords(dishDtoList);


        return R.success(dishDtoPage);
    }

    /**
     * 根据id查询菜品数据，用于回显
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id){

        DishDto dishDto = dishService.getByIdWithFlavor(id);
        return R.success(dishDto);
    }


    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {

        dishService.updateWithFlavor(dishDto);

        //清理所有的菜品的缓存数据
        //Set keys = redisTemplate.keys("dish_*");
        //redisTemplate.delete(keys);

        //清理某个分类下面的菜品缓存数据
        //动态构造key
        String key = "dish_" + dishDto.getCategoryId() + "_1";
        redisTemplate.delete(key);

        return R.success("修改成功");
    }

    /*@GetMapping("/list")
    public R<List<Dish>> list(Dish dish) {
        Long categoryId = dish.getCategoryId();

        LambdaQueryWrapper<Dish> lqw = new LambdaQueryWrapper<>();
        lqw.eq(categoryId != null, Dish::getCategoryId, categoryId);
        //添加条件,查询状态为1(起售状态)的菜品
        lqw.eq(Dish::getStatus, 1);
        lqw.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(lqw);

        return R.success(list);
    }*/

    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish) {
        List<DishDto> listDto = null;

        //动态构造key
        String key = "dish_" + dish.getCategoryId() + "_" + dish.getStatus();

        //先从Redis中获取缓存数据
        listDto = (List<DishDto>) redisTemplate.opsForValue().get(key);

        if (listDto != null) {
            //如果存在,直接返回,无需查询数据库
            return R.success(listDto);
        }

        //如果不存在,需要查询数据库,将查询到的菜品数据缓存到Redis
        Long categoryId = dish.getCategoryId();

        LambdaQueryWrapper<Dish> lqw = new LambdaQueryWrapper<>();
        lqw.eq(categoryId != null, Dish::getCategoryId, categoryId);
        //添加条件,查询状态为1(起售状态)的菜品
        lqw.eq(Dish::getStatus, 1);
        lqw.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(lqw);
        listDto = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();
            BeanUtils.copyProperties(item, dishDto);

            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);
            if (category != null) {
                String name = category.getName();
                dishDto.setCategoryName(name);
            }

            Long id = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId, id);
            List<DishFlavor> dishFlavors = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavors);
            return dishDto;
        }).collect(Collectors.toList());

        //将查询到的菜品数据缓存到Redis
        redisTemplate.opsForValue().set(key, listDto, 60, TimeUnit.MINUTES);

        return R.success(listDto);
    }


}
